SCOTTSDALE, Ariz. (AP) — Vijay Singh has withdrawn from the Phoenix Open, a day after saying he used deer-antler spray.

Singh cited a back injury in pulling out Thursday before the first round.

The 49-year-old Fijian first revealed he used the spray in an interview with Sports Illustrated. The magazine said Singh paid one of Sports With Alternatives To Steroids' owners $9,000 last November for the spray, hologram chips and other products. The deer-antler substance contains a banned performance-enhancer connected to human growth hormone.

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